Circular furnace roof



A ril 17, 1956 Filed Feb. 16, 1953 G. P. REINTJES CIRCULAR FURNACE ROOF 4 Sheets-Sheet l w a? INVENTOR Geon e Reihtjes April 17, 1956 P. REINTJES CIRCULAR FURNACE ROOF 4 Sheets-Sheet 2 Filed Feb. 16, 1953 N M Md R V DI e W l. G Y B April 17, 1956 G. P. REINTJES CIRCULAR FURNACE] ROOF 4 Sheets-Sheet 5 Filed Feb. 16, 1953 m P. Ranges 1 m Gttorm 4 Sheets-Sheet 4 MW C ZSEZS April 17, 1956 G. P. REINTJES CIRCULAR FURNACE ROOF Filed Feb. 16, 1953 United States Patent 2,742,023 ClRCULAR ROQF George P. Reintjes, Kansas City, Mo. Applicationl february 1 6, 1953, Serial No. 337,178

7 6 Claims. 01. 122-4 Thisinventionrelates to circular or arcuate laying of tile, refractories or the like, with the minimum of pos sible shapes. One of the chief objects of the invention is to provide a .suspended circular furnace roof preferably furnaces orwhere charging ports are to be provided in afurnace roof. f h r sbisst hq svsmi nt t P u a o for circular furnaceswhereby predetermined rows of tile are suspended from concentric rings of pipe or rod.

Anotherobject ofthe invention is to provide for the ,water cooling of the supporting rings of circular furnaces and the like.

With the general objects named in view and others as will hereinafter appear, the invention consists in certain novel'and useful.features of construction andbrganiZation of parts as hereinafter described and claimed; and in order that it may be fully understood, reference is to be had to the accompanying drawings, in which:

Figure 1 is a top plan view of an electric furnace roof embodying the invention.

Figure 2 is a cross section through the roof as shown in Figure 1.

Figure 3 is an enlarged fragmental section taken through the inner ring of the roof.

Figure 4 is a modified construction of the center wall for protecting the inner ring and providing a charging opening or for accommodating the electrodes of an electric furnace.

Figure 5 is a section through the outer ring and upper end of a circular furnace.

Figure 6 is a cross section through the center section or subsidiary roof supported by the inner ring.

Figure 7 is a section through a stepped subsidiary roof.

Figure 8 is a diagrammatic view of the lay-out employing rows of tile of uniform length, the outer edge of each tile measuring 3.1416 inches or a multiple thereof.

Referring now to the drawings in detail, 1 is the top edge of a circular furnace framework provided with a refractory lining 2. Adapted to be removably supported by the top of the furnace wall is a metal ring 3, formed with an inwardly projecting flange or shelf 5 which may form part of a water cooling passageway 4.

Extending inwardly from the ring 3 are a series of beams 6, which preferably are in radial relation to the ring and are inclined upwardly as shown. Extending downwardly from the beams 6 are any suitable suspension means which may be eye-bolts 7 or U-bolts 8 which in turn carry concentric rows of arcuate pipes or rods 9.

length selected for each tile one additional straight pi tile per row,

dered by preferen'ceQtO carry a row of T-shaped filler tile 12 between eachrow of suspendedltile. Concentric rows of tile arethus provided, all of said tilerowsbeingof equal width. To avoid the. necessity of innumerable shapes, all tile at their outer edges, may measure's'ubstantiaily 3.1416 inches in width, orfare multiples thereof.

With this arrangement and measuring outwardly from the center of the furnace in multiples corresponding to, the row, for example, a tile length of7.5", the'first tile A, -Figure 8, will have the width of its outer'ed'ge substantially, equal 3.1416 inches, or any multiple thereof, theftile of the next row fB, at their outer ed'ge, will also measure 3.1416 in'ches',,a'nd their width at the inner edge will be 3.14l6"/2, etc. as shown in the following table in which the symbolpi is substituted ,for,3,1416" asa matter of. convenience:

. Length outer edge Lcngt h Sixthrow will comprise five tile duplicating the tile of the 5th row, plus one tile of pi width and parallel sides. 7

Each succeeding row will duplicate the 6th row, with the addition of tile dupllcatingthe tile o t the 5th row, plus two tile of pi width and parallel sides, step, row f0r row, each row addiug an additional straight-tile.

A completely circular, furnace of 360, may thus be considered to be madeup of segments equalling 3 60/dia. 1st row. 1 In ,theprioportions shown in fthis "case, the tile measure 7.5", making lithe. initial ,dian'iete'r .15.", and 360/ 15 equalsjd segments, ea'ch ofl2'4f inwidth,

The present roof i's shown en an elec'tric furnace for ferrous metals and is equipped with thr'e'e electrodes, the arc bridging between the two negative and one positive electrode alternately. In this construction the electrodes are ordinarily positioned near the center of the furnace and this area is subject to extreme erosion and spawling, due to thermal shock, the escape of gases around the electrodes, and the fact the furnace roof must stand-up under translation to and from the furnace. The invention, therefore, contemplates sectionalizing the furnace roof to provide it with independently transportable or replaceable subsidiary roofs or sections. In the present embodiment, the supporting beams 6 carry a secondary ring 7a which may be located at any point with reference to the main roof, but is illustrated as positioned concentrically and above the main roof outer ring 3. The ring 7a is also provided with an inner shelf or shoulder 8a which may constitute part of a water cooling chamber 9a, if desired. Adapted to rest on the shoulder 8a is a circular frame 10a which is formed with an angle 11a on which an arch 12a is carried, this being the subsidiary roof. It is shown as having openings 13 to accommodate electrodes 14. Although the subsidiary roof 12a can be a sprung arch, it is preferably relatively fiat as shown in Figure 6, the inner ring of tile 15 being relieved at their lower edges as at 16. With this arrangement the pressure line from the lower outer corners of the outer tile row 17 to the inner row 15 will insure that the arch rises on expansion due to heat. Another similar arch arrangement is shown in Figure 7 where each row of tile 18 is stepped upwardly.

The subsidiary roof carried by ring 7a is in a higher plane than that of the main roof, the parts being so made that a circular wall 19 completes the main roof, said scrihedby' a series of's'qua edges in line'wi'th the "concentric 'tile"rows multiples of in the: subsidiaryroof.

wall -extendingupwardly to such height that it intercepts radiant heat" of' the 'fur'na'ce'and' protectsdheinner ring 7a, when the smaller or subsidiary roof is removed from position, In order to protecgthe frame, 10g frorrrthe "at 'of'ithe furnace, the Io er' r g""of tile lfl'l' is'ifotfiiied 'wr hil 'ps 20IP iQt i gB 1 w,. a or mafiangeua while the upper course of the wal1f1 9 1s otc'hed as'at'f21 to fprotect'jthe lip 20' when the'subsidiary roof is replace. Each of "the, openin gsj a u'ild' the electrodes is circumpi so i that they" may "be conveniefitly' and snugly fitted parent; that I haye produced a' construction" embodying "all o f' the'featll res' of advantage s'etforth as desirable, and wane I have described and illustrated Ithe preferied 'ernbodirrient, iris to 'bejunderstood that Lieserve th right toall changes within thespiritand scope of the appended claims. I

l :v.,t r 1. In a circular'fu'rn'aceroof, a ring support, a second ring within the first ring, beams cantilevered from the first ring and supporting the second ring, roof tile suspended from the beams and filling the'space between the first andsecond rings, and a subsidiary roof removably supported by the inner ring. I I H 2. In acircular furnace roof, a ring support, a second I ring concentrical to the first ring,'he'an;1sj cantilevered from the first ring and supporting the second ring, roof tile suspended from the beams and filling the space between the first and second rings, and a subsidiary roof removably carried by the inner ring. I

' 3. In a circular furnace having an open upper end, a ring supported by the furnace and concentric with the open upper end thereof, a series of beams carriedby the ring and extending inwardly in spaced relation; a'second ring supported by the beams "concentricf tq the first ring, and abutting tile rows filling the area 'withinthe second ring and the spacebetween' thepairs of rings, andfiller'blo'cks inserted between the inner ringand the first tile row, all of said tile b'eing'of uniform length.

ringsupported' 4. In a circular furnace having an open upper end, a byandwoneentric with" theuppefend "of the furnace, a series of beams carried by the ring and extending inwardly in spaced relation, a second ring carried by the beams concentric to the first ring, a circular frame removably carried by the second ring, tile filling the space between the first and second rings, a row of filler block lining the frame, andconcentric rows of tile filling the space within the filler block row. A I

5. In a circular furnace"h'avingan open upper end, a ring carried byand concentric with the'upper end of the furnace, beams extending inwardly firorn the ring, arcuate pipe sections suspended front the beams in" concentric rows of uniform width, rows.':of abutting tile suspended from the pipe, a ring supported by the inner ends of said beams and spaced above the tile, a circular wall 05 tile extending upwardly from the roof tile to protect the inner ring against radiation from the furnace, a reinovabl'e circular framei'supported the inner ring, and

tile filling said'c'ircul ar frame' p A h 6."In' a circular furnace roof, a' ring support, a' 'se cond ring within the first ring, beams' cantilevered from thefirst ring" and 's'iipporting' the Tsecond ring, eachof said being water: cooled, roof 'tile' suspended from the "beams and filling the spaceibe tvveenfthe' first and second rings,

and a' subsidiary roof removably supportedby the inner "rlng.

' 'Rferenees' Cited in'the fileioi patent UNITED STATES PATENTS "1,274,034 Griflin'; July 30,1918 1,524,033 Hawke "Ian.- 27, 1925 1,541,486 Dobie Iune9, 1925 1,769,894 "Wonningj July 1,1930 2,021,424 McPherson Nov. 19, 1935 2,274,240 Ladd "Feb';'24,"1942 2,659,327 "Honig jNov. 17, 1953 H FOREIGN PATENTS r j 5,852,963 France 'Nov. 9; 1939 1,016,560 France Aug. 27, 1952 

